someguy:thats dumb.
me:your mom is dumb.
someguy:you are juvinile and ugly.
me:your mom is juvinile and ugly.
someguy:uuugg...goddammit *head explodes*
An overused phrase (much like your mom), especially in jokes, or heated conversation. Also serves as a mark of stupidity when you can't come up with anything else to say.